Burglar-alarm.



No. 773,650. v PATBNTED NOV. l, 1904. J. E'. KUHRY & C. A. YOUNGREN.

BURGLAR ALARM.

APPLIGATION FILED JULY 17, 190s.

No MODELA UNITED STATES Patented November 1, 1904.

:PATENT OEEICE.

.IOHN EEEDRIOK IIUHRY AND cHARLEs AUeEsTIs YOUNGEEN, OE sIOUx OITY, IOWA. l a

BURGLAR-ALARNI.

SPECIFICATION forming part of Letters Patent N o. 773,650, dated November 1, 1904.

Application filed July 17, 1903.

To @ZZ whom, t party concern.-

Be it known that we, J OHNFREDRIOK KUHRY and CHARLES AUGEsTIs YOUNGREN, citizens of the United States, residing at Sioux City, in the county of Woodbury and State of Iowa, have invented a new .and useful Burglar- Alarm, of which the following' is a specification.

The invention relates to improvements in burglar-alarms.

The Object of the present invention is to improve the construction of burglar-alarms and to provide a simple, inexpensive, and etlicient detonating burglar-alarm designed to be located adjacent to a window or door and adapted to explode a cartridge, and thereby alarm the occupants of a house or an apartment and at the same time frighten intruders should an attempt be made to enter such house or apartment.

A further object of the invention is to provide aburglar-alarm of this character adapted to permit the sash of a window to be partially raised to afford ventilation and capable of being operated should the sash be raised to a greater extent. v t

Another object of the invention is to provide a burglar-alarm which will be invisible from the exterior and located out of harms way and which may be readily thrown out of Operation when it is desired to open the window to which it is applied.

Another object of the invention is to provide a burglar-alarm adapted to afford ready access to the spring for actuating the firingpin and capable of enabling the tension of the same to be increased should the spring weaken Y with use.

Furthermore, it is the object of the invention to provide a burglar-alarm which will be exceedingly sensitive and which will require.

only a slight throw or movement of the trigger to release the firing-pin.

Vith these and other objects in View the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, pro- Serial No. 166,017. (No model.)

tion within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention. y

In the drawings, Figure l is a horizontal sectional View of a portion of a window provided witha burglar-alarm constructed in accordance with this invention. Fig. 2 is a perspective view of the burglar-alarm detached. Fig. 3 is a longitudinal sectional View of the same. Fig. 4 is a transverse sectional View of the burglar-alarm. s Fig'. 5 is a detail view of the firing-pin.

Like-numerals of reference designate corresponding parts in all the gures of the drawings. I i l designates a supporting-frame consisting of abar provided at its en ds with arms 2 and 3 and having' an approximately centrally-arf ranged arm 4, located between the arms 2 and 3, as clearly shown in Fig. 2 of the drawings. The bar, which constitutes the body portion of the frame, is provided with suitable countersunk perforations 5 for the reception of screws or other suitable fastening devices for securing it to a window-casing, as shown in Fig. l, or to adoor-casing, as hereinafter explained. The frarne is designed to be arranged horizontally at one side of a window-casing, and the arms extend outward horizontally therefrom. The arm 2 is provided with an opening 6, forming a socket for a cartridge 7, as shown in Fig. 3, a center-fire cartridge being preferably employed; but an ordinary rim-tire cartridge may of course be used, if desired.

The arms 3 and 4 are provided with alined guide-openings 8 and 9 for the reception of a tiring-pin l0, which is actuated by a coiled spring l1, disposed on the firing-pin and interposed between the arm 3 and an adjustable block 12. The adjustable block l2, which is provided with an opening to receive the iiringpin, is secured to the same by a set-screw 13, and it has a fiat inner side face 14, arranged contiguous to the outer side face of the body portion of the supporting-frame and adapted to prevent the firing-pin from rotating in the openings of the guide-arms 3 and 4. The setscrew 13 is mounted in a threaded perforation of the adjustable block 12, and it is adapted to permit the block to be moved longitudinally of the iiring-pin to enable any desired tension to be placed on the spring 11 and to increase the tension thereof as the spring becomes loose through wear and use. The engaging end 15 of the firing-pin is tapered, as shown, and the rear portion of the firing-pin is provided at one side with a notch 16, located beneath the firing-pin and adapted to be engaged by the inner arm of a trigger 17, which is pivoted between its ends to the arm 3 of the supporting-frame by a pin 18. The pin 18 is arranged in a suitable perforation of the arm 3, and it may be formed integral with the trigger, as shown, or be constructed in any other desired manner.

The outer arm or portion of the pivoted trigger projects beyond the supporting-frame and is arranged in the path of a screw 19, designed to be mounted on the lower sash 20 and adaptedto be adjusted to any position thereon with relation to the trigger, whereby the sash may be opened any distance at the bottom for ventilation. Any attempt to open the sash a greater distance will carry the screw 19 upward into contact with the outer arm of the trigger, which will be oscillated to carry its inner arm downward out of engagement with the shoulder of the firing-pin. A Very slight upward movement of the outer arm of the trigger will release the firing-pin, which will be thrown against the cartridge by the coiled spring.

The outer arm of the trigger is longer and heavier than the inner arm, and the tiringpin when in engagement'y with a cartridge, as shown in Fig. 3, terminates short of the end of the frame upon which the trigger is mounted to permit the weighted arm of the trigger to swing the latter to an upright position out of the path of the screw 19. By this construction and arrangement the burglar-alarm may be thrown out of operation when desired.

The burglar-alarm may be mounted on a door-casing in position to permit the trigger to be either actuated directly by the door or by a screw or projection carried by the door.

What we claim is# 1. A burglar-alarm comprising a supporting-frame provided with guides and having means for receiving a cartridge, a firing-pin arranged in the guides and adapted to engage a cartridge, a trigger for engaging the firingpin, a coiled spring disposed on the tiring-pin, and an adjustable block secured to the firingpin and slidable on the frame, and holding the iiring-pin in position for engagement with the trigger and engaging the spring to vary the tension thereof, substantially as described.

2. A burglar-alarm comprising a horizontal frame, a spring-actuated firing-pin mounted on the frame and provided with a shoulder, a pivotally mounted trigger disposed transversely of the frame and arranged to engage the shoulder of the firing-pin and having a weighted arm extending beyond the frame and disposed approximately horizontal when the burglar-alarm is set and arranged to swing downward to support the trigger in an upright position out of the way when the burglar-alarm is discharged, and a fastening device designed to be mounted on a sash and arranged at right angles to the trigger for engagement with the weighted arm, substantially as described.

3. A burglar-alarm, comprising a frame, a reciprocating firing-pin mounted on the frame and provided at one side with a shoulder, a coiled spring disposed on the pin, a trigger for engagement with the shoulder, and a block adjustably secured to the pin and engaging the spring, said block being slidable on the frame to maintain the shoulder in position for engagement with the trigger, substantially as described.

In testimony that we claim the foregoing as our own we have hereto aiiiXed our signatures in the presence of two witnesses.

JOHN FREDRICK KUI'IRY. CHARLES AUGESTIS YOUNGREN.

Witnesses:

L. C. LEssENIcH, W. B. VATIoN. 

